package com.rainbow.utils;

import java.util.Collection;
import java.util.Map;

/**
 * Assert utility class that assists in validating arguments. Useful for
 * identifying programmer errors early and obviously at runtime.
 * 
 * <p>
 * For example, if the contract of a public method states it does not allow null
 * arguments, Assert can be used to validate that contract. Doing this clearly
 * indicates a contract violation when it occurs and protects the class's
 * invariants.
 * 
 * <p>
 * Typically used to validate method arguments rather than configuration
 * properties, to check for cases that are usually programmer errors rather than
 * configuration errors. In contrast to config initialization code, there is
 * usally no point in falling back to defaults in such methods.
 * 
 * <p>
 * This class is similar to JUnit's assertion library. If an argument value is
 * deemed invalid, an IllegalArgumentException is thrown. For example:
 * 
 * <pre>
 * Assert.notNull(clazz, &quot;The class must not be null&quot;);
 * Assert.isTrue(i &gt; 0, &quot;The value must be greater than zero&quot;);
 * </pre>
 * 
 * Mainly for internal use within the framework; consider Jakarta's Commons Lang
 * >= 2.0 for a more comprehensive suite of assertion utilities.
 * 
 * @author Keith Donald
 * @author Juergen Hoeller
 * @author Colin Sampaleanu
 * @since 1.1.2
 */
public abstract class Assert {

	private Assert() {

	}

	/**
	 * Assert a boolean expression, throwing
	 * <code>IllegalArgumentException</code> if the test com.zhongwang.result is
	 * <code>false</code>.
	 * 
	 * <pre>
	 * Assert.isTrue(i &gt; 0, &quot;The value must be greater than zero&quot;);
	 * </pre>
	 * 
	 * @param expression
	 *            a boolean expression
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 * @throws IllegalArgumentException
	 *             if expression is <code>false</code>
	 */
	public static void isTrue(boolean expression, String message) {
		if (!expression) {
			throw new IllegalArgumentException(message);
		}
	}

	/**
	 * Assert a boolean expression, throwing
	 * <code>IllegalArgumentException</code> if the test com.zhongwang.result is
	 * <code>false</code>.
	 * 
	 * <pre>
	 * Assert.isTrue(i &gt; 0);
	 * </pre>
	 * 
	 * @param expression
	 *            a boolean expression
	 * @throws IllegalArgumentException
	 *             if expression is <code>false</code>
	 */
	public static void isTrue(boolean expression) {
		isTrue(expression, "[Assertion failed] - this expression must be true");
	}

	/**
	 * Assert that an object is not null.
	 * 
	 * <pre>
	 * Assert.notNull(clazz, &quot;The class must not be null&quot;);
	 * </pre>
	 * 
	 * @param object
	 *            the object to check
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 * @throws IllegalArgumentException
	 *             if the object is <code>null</code>
	 */
	public static void notNull(Object object, String message) {
		if (object == null) {
			throw new IllegalArgumentException(message);
		}
	}

	/**
	 * Assert that an object is not null.
	 * 
	 * <pre>
	 * Assert.notNull(clazz);
	 * </pre>
	 * 
	 * @param object
	 *            the object to check
	 * @throws IllegalArgumentException
	 *             if the object is <code>null</code>
	 */
	public static void notNull(Object object) {
		notNull(object,
				"[Assertion failed] - this argument is required; it cannot be null");
	}





	/**
	 * Assert that the given com.zhongwang.text does not contain the given substring.
	 * 
	 * <pre>
	 * Assert.doesNotContain(name, &quot;rod&quot;, &quot;Name must not contain 'rod'&quot;);
	 * </pre>
	 * 
	 * @param textToSearch
	 *            the com.zhongwang.text to search
	 * @param substring
	 *            the substring to find within the com.zhongwang.text
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 */
	public static void doesNotContain(String textToSearch, String substring,
			String message) {
		if (textToSearch.indexOf(substring) != -1) {
			throw new IllegalArgumentException(message);
		}
	}

	/**
	 * Assert that the given com.zhongwang.text does not contain the given substring.
	 * 
	 * <pre>
	 * Assert.doesNotContain(name, &quot;rod&quot;);
	 * </pre>
	 * 
	 * @param textToSearch
	 *            the com.zhongwang.text to search
	 * @param substring
	 *            the substring to find within the com.zhongwang.text
	 */
	public static void doesNotContain(String textToSearch, String substring) {
		doesNotContain(textToSearch, substring, "[Assertion failed] - "
				+ "this String argument must not contain the substring ["
				+ substring + "]");
	}

	/**
	 * Assert that an array has elements; that is, it must not be
	 * <code>null</code> and must have at least one element.
	 * 
	 * <pre>
	 * Assert.notEmpty(array, &quot;The array must have elements&quot;);
	 * </pre>
	 * 
	 * @param array
	 *            the array to check
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 * @throws IllegalArgumentException
	 *             if the object array is <code>null</code> or has no elements
	 */
	public static void notEmpty(Object[] array, String message) {
		if (array == null || array.length == 0) {
			throw new IllegalArgumentException(message);
		}
	}

	/**
	 * Assert that an array has elements; that is, it must not be
	 * <code>null</code> and must have at least one element.
	 * 
	 * <pre>
	 * Assert.notEmpty(array);
	 * </pre>
	 * 
	 * @param array
	 *            the array to check
	 * @throws IllegalArgumentException
	 *             if the object array is <code>null</code> or has no elements
	 */
	public static void notEmpty(Object[] array) {
		notEmpty(
				array,
				"[Assertion failed] - "
						+ "this array must not be empty: it must contain at least 1 element");
	}

	/**
	 * Assert that a collection has elements; that is, it must not be
	 * <code>null</code> and must have at least one element.
	 * 
	 * <pre>
	 * Assert.notEmpty(collection, &quot;Collection must have elements&quot;);
	 * </pre>
	 * 
	 * @param collection
	 *            the collection to check
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 * @throws IllegalArgumentException
	 *             if the collection is <code>null</code> or has no elements
	 */
	public static void notEmpty(Collection collection, String message) {
		if (collection == null || collection.isEmpty()) {
			throw new IllegalArgumentException(message);
		}
	}

	/**
	 * Assert that a collection has elements; that is, it must not be
	 * <code>null</code> and must have at least one element.
	 * 
	 * <pre>
	 * Assert.notEmpty(collection, &quot;Collection must have elements&quot;);
	 * </pre>
	 * 
	 * @param collection
	 *            the collection to check
	 * @throws IllegalArgumentException
	 *             if the collection is <code>null</code> or has no elements
	 */
	public static void notEmpty(Collection collection) {
		notEmpty(collection, "[Assertion failed] - this collection must "
				+ "not be empty: it must contain at least 1 element");
	}

	/**
	 * Assert that a Map has entries; that is, it must not be <code>null</code>
	 * and must have at least one entry.
	 * 
	 * <pre>
	 * Assert.notEmpty(map, &quot;Map must have entries&quot;);
	 * </pre>
	 * 
	 * @param map
	 *            the map to check
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 * @throws IllegalArgumentException
	 *             if the map is <code>null</code> or has no entries
	 */
	public static void notEmpty(Map map, String message) {
		if (map == null || map.isEmpty()) {
			throw new IllegalArgumentException(message);
		}
	}

	/**
	 * Assert that a Map has entries; that is, it must not be <code>null</code>
	 * and must have at least one entry.
	 * 
	 * <pre>
	 * Assert.notEmpty(map);
	 * </pre>
	 * 
	 * @param map
	 *            the map to check
	 * @throws IllegalArgumentException
	 *             if the map is <code>null</code> or has no entries
	 */
	public static void notEmpty(Map map) {
		notEmpty(
				map,
				"[Assertion failed] - this map must not be empty; it must contain at least one entry");
	}

	/**
	 * Assert that the provided object is an instance of the provided class.
	 * 
	 * <pre>
	 * Assert.instanceOf(Foo.class, foo);
	 * </pre>
	 * 
	 * @param clazz
	 *            the required class
	 * @param obj
	 *            the object to check
	 * @throws IllegalArgumentException
	 *             if the object is not an instance of clazz
	 * @see Class#isInstance
	 */
	public static void isInstanceOf(Class clazz, Object obj) {
		isInstanceOf(clazz, obj, "");
	}

	/**
	 * Assert that the provided object is an instance of the provided class.
	 * 
	 * <pre>
	 * Assert.instanceOf(Foo.class, foo);
	 * </pre>
	 * 
	 * @param clazz
	 *            the required class
	 * @param obj
	 *            the object to check
	 * @param message
	 *            a message which will be prepended to the message produced by
	 *            the function itself, and which may be used to provide context.
	 *            It should normally end in a ":" or ". " so that the function
	 *            generate message looks ok when prepended to it.
	 * @throws IllegalArgumentException
	 *             if the object is not an instance of clazz
	 * @see Class#isInstance
	 */
	public static void isInstanceOf(Class clazz, Object obj, String message) {
		Assert.notNull(clazz,
				"The clazz to perform the instanceof assertion cannot be null");
		Assert.isTrue(clazz.isInstance(obj), message + "Object of class '"
				+ (obj != null ? obj.getClass().getName() : "[null]")
				+ "' must be an instance of '" + clazz.getName() + "'");
	}

	/**
	 * Assert a boolean expression, throwing <code>IllegalStateException</code>
	 * if the test com.zhongwang.result is <code>false</code>. Call isTrue if you wish to
	 * throw IllegalArgumentException on an assertion failure.
	 * 
	 * <pre>
	 * Assert.state(id == null, &quot;The id property must not already be initialized&quot;);
	 * </pre>
	 * 
	 * @param expression
	 *            a boolean expression
	 * @param message
	 *            the com.zhongwang.exception message to use if the assertion fails
	 * @throws IllegalStateException
	 *             if expression is <code>false</code>
	 */
	public static void state(boolean expression, String message) {
		if (!expression) {
			throw new IllegalStateException(message);
		}
	}

	/**
	 * Assert a boolean expression, throwing <code>IllegalStateException</code>
	 * if the test com.zhongwang.result is <code>false</code>. Call isTrue if you wish to
	 * throw IllegalArgumentException on an assertion failure.
	 * 
	 * <pre>
	 * Assert.state(id == null);
	 * </pre>
	 * 
	 * @param expression
	 *            a boolean expression
	 * @throws IllegalStateException
	 *             if expression is <code>false</code>
	 */
	public static void state(boolean expression) {
		state(expression,
				"[Assertion failed] - this state invariant must be true");
	}

	public static void notEmpty(String cs,String message){
		int strLen;
		if (cs != null && (strLen = cs.length()) != 0) {
			for(int i = 0; i < strLen; ++i) {
				if (!Character.isWhitespace(cs.charAt(i))) {
					return;
				}
			}
			throw new IllegalArgumentException(message);
		} else {
			throw new IllegalArgumentException(message);
		}
	}

	public static void notEmpty(String cs){
		notEmpty(cs,"[Assertion failed] - this argument is required; it cannot be empty");
	}

	public static void main(String[] args) {
		String str = "";
		org.springframework.util.Assert.hasText(str);
	}
}